The Mi-171A3 helicopter has completed certification in an import-substituted configuration and received approval for flights over open sea and offshore oil and gas fields. The Russian Federal Air Transport Agency (Rosaviatsiya) issued seven Type Certificate Amendments, including approval for a convertible offshore configuration capable of operating over extended water surfaces.
The helicopter is designed for passenger and cargo transport, instrument flight in adverse weather, and operations from elevated landing sites. Test flights were conducted in the mountains of Kabardino-Balkaria, winter conditions in Salekhard, and on a Caspian Sea offshore platform. The emergency water-landing system was tested under various scenarios, including simulated dual-engine failure during main rotor autorotation. After water landings, passengers evacuate into two life rafts, each accommodating 22 people and equipped with complete survival kits.
The Mi-171A3’s emergency flotation system enables safe water landings in sea states up to 5 (Beaufort scale), allowing operations at significant distances from the shore. Four inflatable pontoons are installed in pairs at the nose and tail sections of the fuselage and deploy automatically upon water contact.
Prior to flight tests, the system underwent extensive ground testing, numerical simulations, and a digital-twin crash test at Saint Petersburg Polytechnic University. The helicopter’s buoyancy and stability were validated in the TsAGI hydrodynamic channel and on open water. The first in-flight deployment of the pontoons occurred in summer 2025. Tests confirmed system reliability and evaluated the impact of deployed floats on aerodynamics, handling, and maneuverability.
The helicopter is equipped with a domestically produced crash-resistant fuel system. Flexible tanks, pumps, and fuel gauges withstand impact from drops exceeding 50 feet, preventing fuel spills and fires. This represents the first fully Russian crash-resistant fuel system made entirely from domestic components.
During certification, over 500 test flights were conducted under extreme climatic and geographic conditions with simulated emergency scenarios. All trials confirmed that the Mi-171A3 meets modern Russian and international airworthiness standards for helicopters of this class.
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